As a Chicago resident who is NOT a Cubs fan, I feel a tiny bit of sadness, not so much because I like the Cubs, but watching the games gave me another excuse to go out and drink with my friends. But it seems so inevitable in retrospect... the Cubs are simply destined to never win.
A few words about Game 6... as it has been said, the fan reaching for the ball that Alou was going to catch was not the reason the Cubs lost that game. The Cubs lost because Prior walked Castillo to put runners on 1st and 2nd, because Rodriguez, Lee, and Mordecai got big hits, because Gonazlez made an error, and because Sosa missed a cut off man. Not much has been made of this play, but when Conine hits his sac fly with the bases loaded to make the score 4-3, Sosa overthrows the cut off man and the other base runners advance to second and third. Baker orders an intentional walk which sets up Mordecai's bases clearing double. I would argue Sosa's inept throw was as big a contributing factor to the Marlin's 8 run outburst as anything else that inning.
I have never subscribed to the "single play determining the outcome of the game" theory, and the Cubs had plenty of chances to stop the Marlins, regardless of what that fan does. Since someone mentioned Bill Buckner of the 1986 Red Sox, I should also point out a few things about that game. First, many people forget that was a Game 6, and that the score was already tied when Buckner made the error which allowed the winning run to score. The Red Sox had been up by two runs, but they allowed one run on three consecutive singles by the Mets, and then Bob Stanley uncorked a wild pitch which allowed Kevin Mitchell to score with the tying run. If Buckner fielded the ball cleanly, the score would have only have been tied, the Red Sox don't just walk off and win. And. since it was a Game 6, it is not like the Red Sox didn't have the chance to still win the series with a victory in the next game. They didn't, but my point is, Buckner didn't lose that series for the Red Sox. I will also add, that what is totally forgotten about the 1986 World Series was that the Mets lost Game 1 by a score of 1-0, because Tim Teufel, their second baseman, let a groundball go through his legs, which allowed the only run of the game to score. Errors are part of the game, and so are bizarre incidents involving the fans. The key is how teams respond to these events that determines ballgames.